Re: Re[2]: Scott gap

• To: tesla-at-pupman-dot-com
• Subject: Re: Re[2]: Scott gap
• From: "Dan and Nancy" <ntesla-at-ntesla.csd.sc.edu> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 15 Apr 2000 08:40:05 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

At 11:37 AM 4/14/00 -0600, you wrote:
>Original Poster: "ROBERT CRESSLER" <robert.cressler-at-menasha-dot-com> 
>
>   dan,paul,all
>
>>Original Poster: "Dan Kline" <ntesla-at-ntesla.csd.sc.edu> 
> > big snip
> >The only real difference I can see, as far as specs are concerned is that
>>G-10 has a tensile strength of 40,000 lbs/sq.in., while GP03 has a tensile
>>strength of 10,000 lbs/sq.in. Everything else seems very close.
>>snip
> the GPO (non woven glass/polyester binder) series main disadvantage(s)
>compared to glass epoxies (e.g. G-10) are increased variations in electrical
>properties from humidity , susceptibility to cracking from thermal
>shock,and lower adhesion to substrates (ie using adhesives).
>a good way to visualize the differences in composition is the G-10 series
are 
>marine grade plywood,while the GPO would be more like particle board.
>Also,the specification:
>>Electrical Grade Fiberglass (GP03)
>*> Temp. Range: 0° to 400° F
>I am VERY skeptical of this figure and recommend using at this temp with
>CAUTION.My sources give a 265*f max continuous for GPO-3
>and 285*F for G-10.......IMHO...if I was going to push anything to 400*F
>(especially a rotor/electrodes) I would put my faith in G-10  way before
>GPO-3 .
>Robert 

Hi Robert,
Those are good points and I'll check with McMaster-Carr to see if they'll
tell me where they got those specs. On the other hand, a 1/2" thick  12"
square isn't bad at ~$12.50 for a test rotor or gap :) What is the source
of your specs, by the way...?
Thanks,
Dan

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